210000022101 has 24 divisors (see below), whose sum is σ = 311596714520. Its totient is φ = 136187744256.

The previous prime is 210000022031. The next prime is 210000022129. The reversal of 210000022101 is 101220000012.

It can be written as a sum of positive squares in 4 ways, for example, as 90871499601 + 119128522500 = 301449^2 + 345150^2 .

It is not a de Polignac number, because 210000022101 - 2⁹ = 210000021589 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210000022171) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1591221 + ... + 1718133.

Almost surely, 2^210000022101 is an apocalyptic number.

It is an amenable number.

210000022101 is a deficient number, since it is larger than the sum of its proper divisors (101596692419).

210000022101 is a wasteful number, since it uses less digits than its factorization.

210000022101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131925 (or 131922 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 210000022101 its reverse (101220000012), we get a palindrome (311220022113).

The spelling of 210000022101 in words is "two hundred ten billion, twenty-two thousand, one hundred one".